{
  "name": "Brazilian helicopter accident rates by aircraft type and operating rule, 2015-2024",
  "description": "CENIPA accident records joined to ANAC model-level flight hours to produce exposure-adjusted accident rates per 100,000 flight hours, with exact (Garwood) Poisson 95% confidence intervals. Published by Vanguard Attache; both regulators publish the inputs, neither publishes the join.",
  "creator": "Vanguard Attache",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "temporalCoverage": "2015-01-01/2024-12-31",
  "spatialCoverage": "Brazil",
  "datePublished": "2026-08-09",
  "totals": {
    "flight_hours": 2983749,
    "accidents": 170,
    "fatal_accidents": 51,
    "fatalities": 121,
    "national_rate_per_100k_hours": 5.7
  },
  "by_engine_architecture": [
    { "class": "Single-engine piston", "flight_hours": 558656, "accidents": 82, "fatal_accidents": 19, "fatalities": 43, "rate_per_100k_hours": 14.68, "ci95_low": 11.67, "ci95_high": 18.22, "fatal_rate_per_100k_hours": 3.4 },
    { "class": "Single-engine turbine", "flight_hours": 1174800, "accidents": 71, "fatal_accidents": 22, "fatalities": 44, "rate_per_100k_hours": 6.04, "ci95_low": 4.72, "ci95_high": 7.62, "fatal_rate_per_100k_hours": 1.87 },
    { "class": "Twin-engine turbine", "flight_hours": 1250293, "accidents": 17, "fatal_accidents": 10, "fatalities": 34, "rate_per_100k_hours": 1.36, "ci95_low": 0.79, "ci95_high": 2.18, "fatal_rate_per_100k_hours": 0.8 }
  ],
  "by_model_family": [
    { "family": "Robinson R44", "flight_hours": 386528, "accidents": 57, "fatal_accidents": 16, "fatalities": 39, "rate_per_100k_hours": 14.75, "ci95_low": 11.17, "ci95_high": 19.11 },
    { "family": "Robinson R22", "flight_hours": 143932, "accidents": 18, "fatal_accidents": 2, "fatalities": 3, "rate_per_100k_hours": 12.51, "ci95_low": 7.41, "ci95_high": 19.76 },
    { "family": "Bell 206", "flight_hours": 130374, "accidents": 16, "fatal_accidents": 9, "fatalities": 20, "rate_per_100k_hours": 12.27, "ci95_low": 7.01, "ci95_high": 19.93 },
    { "family": "Bell 407", "flight_hours": 49129, "accidents": 6, "fatal_accidents": 1, "fatalities": 5, "rate_per_100k_hours": 12.21, "ci95_low": 4.48, "ci95_high": 26.58 },
    { "family": "Airbus AS350/H125", "flight_hours": 641849, "accidents": 34, "fatal_accidents": 10, "fatalities": 17, "rate_per_100k_hours": 5.3, "ci95_low": 3.67, "ci95_high": 7.4 },
    { "family": "Leonardo A109", "flight_hours": 153475, "accidents": 6, "fatal_accidents": 4, "fatalities": 15, "rate_per_100k_hours": 3.91, "ci95_low": 1.43, "ci95_high": 8.51 },
    { "family": "Robinson R66", "flight_hours": 184331, "accidents": 6, "fatal_accidents": 0, "fatalities": 0, "rate_per_100k_hours": 3.26, "ci95_low": 1.19, "ci95_high": 7.08 },
    { "family": "Sikorsky S-76", "flight_hours": 251595, "accidents": 3, "fatal_accidents": 1, "fatalities": 1, "rate_per_100k_hours": 1.19, "ci95_low": 0.25, "ci95_high": 3.48 },
    { "family": "Leonardo AW139", "flight_hours": 312055, "accidents": 1, "fatal_accidents": 0, "fatalities": 0, "rate_per_100k_hours": 0.32, "ci95_low": 0.01, "ci95_high": 1.79 },
    { "family": "Sikorsky S-92", "flight_hours": 237137, "accidents": 0, "fatal_accidents": 0, "fatalities": 0, "rate_per_100k_hours": 0.0, "ci95_low": 0.0, "ci95_high": 1.56 }
  ],
  "commercial_service_rbac135": [
    { "family": "Robinson R44", "flight_hours": 41831, "accidents": 11, "fatal_accidents": 3, "rate_per_100k_hours": 26.3, "ci95_low": 13.13, "ci95_high": 47.05 },
    { "family": "Bell 206", "flight_hours": 54104, "accidents": 4, "fatal_accidents": 2, "rate_per_100k_hours": 7.39, "ci95_low": 2.01, "ci95_high": 18.93 },
    { "family": "Airbus AS350/H125", "flight_hours": 102357, "accidents": 2, "fatal_accidents": 0, "rate_per_100k_hours": 1.95, "ci95_low": 0.24, "ci95_high": 7.06 },
    { "family": "Sikorsky S-76", "flight_hours": 247198, "accidents": 3, "fatal_accidents": 1, "rate_per_100k_hours": 1.21, "ci95_low": 0.25, "ci95_high": 3.55 },
    { "family": "Leonardo AW139", "flight_hours": 305720, "accidents": 1, "fatal_accidents": 0, "rate_per_100k_hours": 0.33, "ci95_low": 0.01, "ci95_high": 1.82 },
    { "family": "Sikorsky S-92", "flight_hours": 231543, "accidents": 0, "fatal_accidents": 0, "rate_per_100k_hours": 0.0, "ci95_low": 0.0, "ci95_high": 1.59 }
  ],
  "rotary_wing_movements_cgna": [
    { "aerodrome": "SBJR", "name": "Jacarepagua, Rio de Janeiro", "2023": 63203, "2024": 64366, "2025": 87815 },
    { "aerodrome": "SBMT", "name": "Campo de Marte, Sao Paulo", "2023": 22692, "2024": 21011, "2025": 25481 },
    { "aerodrome": "SBRJ", "name": "Santos Dumont, Rio de Janeiro", "2023": 3293, "2024": 2849, "2025": 3233 }
  ],
  "city_accident_counts": [
    { "city": "Rio de Janeiro", "accidents_2015_2024": 13, "fatal_accidents_2015_2024": 4, "fatalities_2015_2024": 7, "accidents_2023_2025": 1 },
    { "city": "Sao Paulo", "accidents_2015_2024": 9, "fatal_accidents_2015_2024": 2, "fatalities_2015_2024": 6, "accidents_2023_2025": 2 }
  ],
  "sources": [
    { "id": "N1", "publisher": "CENIPA / COMAER", "dataset": "Ocorrencias Aeronauticas da Aviacao Civil Brasileira (Sistema DEDALO)", "url": "https://dedalo.sti.fab.mil.br/dadosabertos/", "file_update": "2026-05-18" },
    { "id": "D1", "publisher": "ANAC", "dataset": "Horas Voadas de Aeronave", "url": "https://www.anac.gov.br/acesso-a-informacao/dados-abertos/areas-de-atuacao/voos-e-operacoes-aereas/horas-voadas-por-aeronave/metadados-do-conjunto-de-dados-horas-voadas-de-aeronave", "file_date": "2025-02-03", "data_coverage": "2010-01 to 2025-01" },
    { "id": "D2", "publisher": "ANAC", "dataset": "Registro Aeronautico Brasileiro", "url": "https://www.anac.gov.br/acesso-a-informacao/dados-abertos/areas-de-atuacao/aeronaves/registro-aeronautico-brasileiro", "retrieved": "2026-08-09" },
    { "id": "M1", "publisher": "CGNA / DECEA", "dataset": "Anuario Estatistico de Trafego Aereo 2025", "url": "https://portal.cgna.decea.mil.br/files/uploads/anuario_estatistico/anuario_estatistico_2025.pdf" },
    { "id": "H1", "publisher": "ANAC", "dataset": "Seguranca Operacional para Helicopteros (2011 data)", "url": "https://www2.anac.gov.br/SGSO2/Semin%C3%A1rios/Seguran%C3%A7a%20Operacional%20para%20Helic%C3%B3pteros.pdf" },
    { "id": "R1", "publisher": "FAA / Federal Register", "dataset": "SFAR 73 final rule", "url": "https://www.federalregister.gov/documents/2024/07/23/2024-15924/robinson-helicopter-r-22-and-r-44-special-training-and-experience-requirements", "published": "2024-07-23" }
  ],
  "method": {
    "numerator": "CENIPA ACIDENTE records only; serious incidents and ordinary incidents excluded, never pooled.",
    "denominator": "ANAC horas_voadas rows with cd_cls starting H, summed by model family over 2015-2024.",
    "confidence_intervals": "Exact (Garwood) Poisson intervals on the accident count.",
    "exposure_floor": "Families under 20,000 hours in the window are reported but not ranked.",
    "sensitivity": "Excluding ANAC's estimated/interpolated hours (10.8% of exposure) raises every rate; R44 moves 14.75 to 17.28. Headline figures use the full denominator, the conservative choice."
  }
}